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What kind of magic do you like the most, and why?
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It's unlikely that they can win a hopeless battle.
In Heroes 5, there is a neutral magic school that has no equal in terms of damage and also ignores magic resistance. It is similar to chaos magic. It includes the spells "Devil's Chain" and "Hellfire."
In the early stages, the hell wave deals 250 damage. This is enough to incinerate any unwanted creature.
By the way, the Dominate spell works great on Phoenixes, if I'm not mistaken.
And how are you going to win a hopeless battle with Summon when facing more or less substantial armies? It's possible in combination with other spells, no doubt, but with just Summon alone?
I suggest the simplest option: just ignore them and cast Darkness on more suitable targets.
You're mistaken ;) An elemental is an elemental.
What do you mean by "substantial"? 100 dragons? Well, yes, then it's a problem. However, this situation is only possible in single-player scenarios, and even then, there's always a way to avoid letting it drag on.
And you'll see a bunch of zombies slowly and not very effectively beating a bunch of skeletons, or vice versa... Meanwhile, the phoenix, along with the remaining enemy troops, will perfectly decide the outcome of the battle ;)